Which step comes last when using the divide-center method to find the trend line on a scatterplot?

The last step in using the divide-center method to find the trend line on a scatterplot is to calculate the slope and y-intercept of the line based on the calculated averages of the divided segments. After determining the means of the x and y values for the segments, you use these averages to derive the linear equation that represents the trend line. Finally, the trend line is plotted on the scatterplot to visually represent the relationship between the variables.